第2話: 高校生たちが洞窟を探検している最中、智子だけがクラスメートから離れてしまう

A group of high school students is visiting a certain cave on a field trip. A small group of them enters a corridor leading away from the main cave... but one of them, Tomoko, is ultimately left alone. After a few moments, she hears the screams of her classmates from deep inside the cave... (Source: Crunchyroll)

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